Combustion chamber for diesel engines



Aug. 19, 1952 E. GRIESHABER 7 2,607,326

' COMBUSTION CHAMBER FOR DIESEL ENGINES Filed Oct. l8, 194 9 I73 be f I722! dries/$0 Patented Aug. 19, 1952 COMBUSTION CHAMBER FOR DIESEL ENGINES Emil Grieshaber, Milwaukee, ,Wis., assignor to Nordberg Manufacturing Company, Milwaukee, Wis., a corporation of Wisconsin Application October 18, 1949,8erialNo. 122,033

. optimum relation to an energy cell.

Other purposes will appear from time to time in the course of the specification and claims.

My invention is illustrated more orless diagrammatically in the accompanying drawings, wherein:

Figure 1 is a vertical section through the cylinder head; and

Figure 2 is a section on the lines 2-2 of Figure 1.

Like parts are indicated by like symbols throughout the specification and drawings.

I have shown only the head of the engine, the details of the cylinder itself not forming part of the present invention.

Referring to the drawings, I is any suitable cylinder or cylinder liner, the details of which do not of themselves form part of the present invention. The piston is omitted, but it will be understood that any suitable piston may be employed, movable within the cylinder liner I.

2 generally indicates a cylinder head suitably secured to or held in relation to the cylinder by bolts, or other suitable means, not herein shown. Any suitable water jacket spaces 3 may be employed. 4 indicates the air intake passage, any suitable gas exhaust passage being provided in the cylinder head, but not shown in the accompanying drawings. The passages terminate in or communicate with the combustion chamber 5, ingress and egress being controlled by any suitable valves, such as the valve indicated at 6, with its stem 6a mounted for reciprocation in any suitable sleeve I and normally urged toward closed position by any suitable spring 8, compressed between abutments 9 and m.

Liquid fuel is admitted to the chamber by any suitable injection nozzle assembly I2, the details of which do not of themselves form part of the present invention. It will be understood, however, that the fuel is injected through the inlet'passage I3, aligned with the energy cell as sembly, generally indicated at A. This assembly includes a sleeve I4, having the generally 3 Claims. (01. 123-32) conic inlet I5, terminating in a throat I6, which. in turn, communicates with the conicallyexpanded wall portion I'I. I8 indicates the cell proper, with its converging walled entry passage I9, aligned with the neck I6 and aligned generally with the path of delivery of the fuel through the inlet duct I3.

The cylinder head chamber 5 is shown in some detail in Figure 2. In considering the relation of the wall to the energy cell assembly A, the wall portions 511 and 5b converge toward the conic passage I5, the wall 5a lying in a plane generally parallel with the direction of delivery of the fuel, the wall 5b being divergently inclined or curved therefrom. The intermediate wall portion of the chamber 5, between the divergent ends of the portions 5a and 512, forms a sequence of lobes 50,511 and 5e, separated by inward proiections 5 and 59.

The general direction of travel of the fuel or mixture from the energy cell is indicated by arrows. These may be taken as diagrammatic and as indicating generally the type of turbulence which is produced. It will be understood that a uni-directional jet of fuel is delivered from the inlet valve I2 toward and into the power cell of the energy cell unit through the neck It. The return flow from the energycell fans out through the chamber 5 and turbulence takes place generally as shown by the arrows of Figure 2. It will be understood that ignition takes place when the top of the piston, as shown,

closes or practically closes the bottom of the chamber 5. It will be noted that the chamber 5 is off-center in relation to the cylinder bore. the contour of the bore being indicated in dotted line in Figure 2.

It will be realized that whereas I have described and shown a practical and operative device, nevertheless many changes may be made in size, shape, number and disposition of parts without departing from the spirit of my invention. I therefore wish my description and drawings to be taken as in a broad sense illustrative or diagrammatic, rather than as limiting me to my specific showing herein. For example, the contour, size and number of the lobes 5c, 5d and 5e may be varied. I find it advantageous, however, that the fuel injecting valve I2 delivers fuel in general parallelism with a generally rectilinear wall member 5a and that the resultant delivery from the energy cell diverges throughout the chamber 5, and includes delivery to the various lobes provided, to the end that there may be substantial rotary turbulence localized at the various lobes.

I claim:

1. In an injection type engine having a cylinder and a piston in the cylinder, a cylinder head defining with the cylinder and piston a combustionvspace a .recess in said .cylinder head, of a diameter-less than the diameter of thecylinder, said recess being open to the interior of said cell opening, the remaining lobes being laterally offset from the generally common axis of the nozzle and the cell opening.

2. The structure of claim 1 characterized in that the lobes are generally equi-distant from the cell opening.

3.. Thestructure oilclaimll characterized in that said lobes .are proportioned. and. adapted to receive generally similar proportions of the the cylinder, a closed-ended cell having a FEB-:1 spray from the cell.

stricted opening in communication with the interior of said recess, and a liquid-fueladmitting nozzle formed and adapted to deliver liquidfuel into the recess along an... axis. inn-general,

EMIL GRIESHABER.

REFERENCES CITED TheJoliowi-ng ,lfeferences are of record in the alignment with the axis of .'the-eopening; zof,-;said1. 5 m

cell, the axis of delivery of said nozzle-dieing substantially offset from the center: of said re-r cess, the side wall of said recess-facingthe cell opening having a plurality of iIIWaI'GIYQPIOiQCt' ing portions defining aaseries of adjacent lobes arranged side by side .insaidsidewallnofsaid recess, said .nozzl'e'. being disposed, to. discharge fuel through .an. end lobe of. 's'aid'serie's, toward UNITED STATES PATENTS 

